The objects in the CISCO-CONFIG-COPY-MIB are implemented as read-create which means a walk of this MIB would should nothing unless you created a config copy operation, and instantiated a row in the ccCopyTable. I don't know the exact feature set running on your 876, but I know the CISCO-CONFIG-COPY-MIB is supported in ADVIPSERVICES, and if you try setting the objects in the ccCopyTable, it should work.